Device for maintaining liquids at a constant level in their containers



Jan. 80, 31%23. 1,443,663

. A. R. TRIST. DEVICE FOR MAINTAINING LIouIns AT A CONSTANT LEVEL IN THEIR CoNT ERS.

FILED FEB. 26. 1921. HEETS'SHEET I e 4v Q i I y fix I a I I 4' p 3/ Q fl 5%26:

INVENTOR fiYThI/I'RoncIldTrIsT his FITTORNEY.

Jan. 30, 1923. 1,443,663

. A. R. T DEVICE FOR MAINTAINING LIQUIDS AT NSTANT LEVEL m THEIR CONTAINERS.

FILED FEB. 26, I921 2 s HEETS'SHEET 2 I H l:. R M3: 2):-

\QNIE I;

ks HTTORNEY;

Patented Jan, 3%, H923.

tastes ARTHUR RONALD rarer, or Lennon, ENGLAND.

nnvrcn ron MAINTAINING LreUrns an A oonsrairr LEVEL In 'rrrnrn oon'rainnns.

Application filed February 26, 1921; Serial no. 443,130.

T 0 all w from izf may concern:

Be it known that I, ARTHUR RONALD -lnrs'r, a subject of the King of Great Britain and Ireland, residing at Coronation House, a Lloyds Avenue in the city of London, England, have invented new and useful Improvements in and Relating to Devices for MaintainingLiquids at a Constant Level in Their Containers, of which the following is a specification.

This invention relates to improvements in devices for maintaining liquids ata constant level in their containers, has particular reference to devices for associationwith liquid containers having pressures varying above and below atmospheric pressure and has for its object the provision or means whereby great accuracy of level is easily maintained by devices of simple and robust construction which can be produced at a very low cost and be cheaply maintained at a standard of great operative etliciency. In the past feed water regulator" suitable for maintaining constant level in steam boilers and the like have been used in which a float chamber adapted to be associated with the boiler or the like is provided with a float mechanically connected to a valve which controls the passage of operative fluid from the float chamber to a power relay device adapted to control the passage of feed water or the like. lVhen such a device is used with ordinary steam pressures no diliiculty obtains but if the pressure in the boiler or the like is low or below atmospheric pressure promptness of action is not obtainable and accuracy of level is de stroyed.

This invention consists in the arrangement of a separate operative fluid service whose pressure is independent of the pressure in the float chamber, and in the modification of the arrangement described in the specification of British Letters Patent granted to me under No. 19,296 of 1911 thereby ensuring regularity of action and accuracy of level under all pressure conditions that exist in the float chamber and parts associated therewith.

Referring to the drawings, which form part or this specification,

Figure l is a sectional elevation ot a device constructed in accordance with this invention.

Figure 2 is a sectional elevation of an automatic teed valve suitable for associairrce 6.

tion with the device illustrated in Figure 1.

A float chamber axis associated with the vacuum evaporatoror the like by pipes tothe connections a a of the float chamber a.

, lhe lloat chamber (0 contains a float-,7) suzt- -a.l' ly'disposed relative to the desiredliquid" level to be maintained. The float 7) is con nected by means Vofthe links 0 bell cranks c and rod 0 to a valve (Z having opposed valve faces 6 and adapted to coact with the seat member 9 having opposed valve seats 72, and j. To prevent fluid passing from the float chamber a to the valve d a diaphragm is is provided and between the diaphragm 7v andthe valve (Z with its seat member 9 a negative pressure service Z is arranged and adapted to convey operative fluid under negative pressure to the valve (Z.

A branch m is provided in proximity .to the seat member 9' and communicating with the space between the seats h and j thereof so as to enable the drop of pressure past the valve face to be conveyed to the underside ofthe diaphragm a of the automatic teed valve '0, a pipe or conduit nbeing provided for the purpose. The automatic teed valve 0 operates against the gravity control of the weight 7) to move the valve 9 to its seats 1" to cut o'tl the supply of fluid to the vacuum evaporator or the like associated therewith.

The operation of the device is as follows :Assuming the level of the liquid to be below that predetermined the float Z) acting under gravity will be in the position indicated and have moved the valve face e or the valve (Z of the seat 7 of the memberg and the valve face 7" onto the seat through the lever system c, )1, associated therewith. The negative pressure through the branch 12: is therefore cut ofi? from the under side of the diaphragm n of the auto matic feed valve 0. As a consequence the valve 9 will be moved off its seats 77' by the weight 9 and maintained open until the level in the evaporator or the like reaches that predetermmed, the pressure in the diaphragm chamber escaping past the valve the weight 2). Obviously although a nega-' When the predetermined level is tive pressure power service has been de- 2. In a device as claimed in claim 1 the scribed a positive oressure service may arrangement of a. diaphragm between the 20 float chamber and the float ooerated valve equally Well be en'iployed without departing from the invention.

I claim:

1. In a device for maintaining liquids at a constant level in their containers comprising a float operated valve element with opposed valve faces disposed between opposed valve seats adapted to control a power operated feed valve the arrangement of means element adapted to isolate said valve element from the fluid or fluids in said chamber and enable the valve elementand its seats to be supplied with a fluid the pressure of which is independent of the pressure in the float chamber, substantially as do scribed.

' In testimony whereof I have signed my adapted to isolate the said valve element name to this specification in the presence of: 30

from the fluid or fluids in the charnha containing the float, and means adapted to supply said valve element and its seats with a fluid under a msitive or negative pressure independent of the pressure in the l'loatchamber substantially as described.

tvvo subscribing witnesses.

ARTHUR RONA Ll) 'illlfii.

Vitnesses:

JOHN .Mnnsrnuyn Mason, BEATRICE 1 ROMAN s. 

